- US House of Representatives Law Revision Counsel's Office (also leads to Classification Tables)
- US Government Printing Office
- Article by Sally Kelley on manual updating of Code (1998, rev. 2001, rev. by D. Shetland 2007)
Other useful explanations
- How popular names of legislation (eg. the "Taft-Hartley Act") relate to Titles and sections. The Table of Popular Names itself is here.